v0.1.17

Canvas editing respects locks and zoom limits, with faster undo and cached containment.

New

• CanvasEditor::take_events lets headless callers drain pending events and release retained changes; the view drains them automatically.

Changed

• Undo batches are built in linear time without repeated vector prepends, preserving undo and redo order.
• Rendering and gestures reuse containment indexes for the document and preview, invalidated by edits, measurements and kind changes. Container depths are memoized, including cycles.
• CanvasEditor::selected finds the primary selection without allocating a temporary vector.

Fixed

• Zero or negative snap grid spacing paints no dots instead of hanging rendering.
• Dragging a selection leaves nodes that disallow dragging stationary and selected.
• fit and zoom_to_selection respect both configured zoom limits.